Thank you Drew I shoot 6 16 gauges oldest known mfg 1900,I use light 1 oz trap loads and I suppose that I should have put in the disclaimer that proper loads should be used. I never bother measuring chambers as in the above post I made it clear to use plastic hulls. I found your information interesting, and as I looked through it I no contradiction to my post. I should say in this p.c. era that you shoot any used gun at your own risk. I follow your posts with interest and find you a wealth of knowledge. P.S. I have been shooting vintage 16s about 25 years your Sincerely Will